A complete guide to converting Golang characters to integers

In the Go language, methods for converting characters to integers include: using the strconv.Atoi function to convert strings to integers. Use the strconv.ParseInt function to convert a string to an integer in the specified base. Represents a single Unicode character using a Unicode literal and converts it to an integer.

Complete guide to converting Go language characters to integers

In the Go language, the character type (rune) can represent Unicode characters , while integer types (int, int8, etc.) represent numeric values. Therefore, in some cases, characters need to be converted to integers.

String to integer

Atoi

##strconv.Atoi The function converts a string to an integer.

import (
    "fmt"
    "strconv"
)

func main() {
    str := "1234"
    n, err := strconv.Atoi(str)
    if err != nil {
        fmt.Println(err)
    } else {
        fmt.Println("Int:", n)
    }
}

Output:

Int: 1234

ParseInt

strconv.ParseInt Function converts a string to an integer in the specified base.

n, err := strconv.ParseInt(str, 10, 64) // 10 为十进制基数，64 为位数

Convert a single character to an integer

Use Unicode literal value

Unicode literal value can represent a single Unicode character.

r := '1'
n := int(r - '0')

Practical Case

When processing user input or parsing other data, it is common to need to convert characters into integers. For example:

Read integers from the command line

fmt.Println("请输入一个整数:")
var n int
fmt.Scan(&n) // 从 stdin 读入并解析为整数

Process JSON data

type Data struct {
    Age int `json:"age"`
}

json.Unmarshal(data, &d) // JSON 数据反序列化为结构体

Parse file path

path := "path/to/file.txt"
size := path[len(path)-5:] // 获取文件大小部分
n, err := strconv.Atoi(size)

The above is the detailed content of A complete guide to converting Golang characters to integers. For more information, please follow other related articles on the PHP Chinese website!